Arch, Arch, Arch, and Arch. Arch all the way. Its package manager is absolutely amazing. I haven't came across any other quite as powerful as it. Of course, I love seeing what other distros have to offer. I used to be a big fan of Crunchbang, but, of course, that died. openSUSE is what I'd recommend to anyone not willing to run 'pacman -Syu' biweekly.